Aerial system



' April 1950 P. H. K. G. CORNELIUS 2,505,098

' AERIAL SYSTEM Filed May 5, 1947 PI T512 HANS K4121? GABRIEL COIZAZZZWS.

' INVEN TOR.

BY I- ATIDRIVE'Y Patented Apr. 25, 1950 Bank' andaTiiustfi Gempany, Hartford, 001111., as trustees; 1

Appugspnonmy. 5,1547, Serial-No. Moms: mmerretnenands Mayzl'gilflli The invention -"relat'es aerial systems 1'01" transmitting short waves, which compriseat least two-radiatorsarranged side by sid'e and parallel to one: another;- the mutual distancebetween these radiators'qbeing"jsmall' with" respect 5" to the'length'of a radiator:-; Preferably; a short; circuit'is providedybetween thecorresponding' ends "of the radiatorsyit is frequentlyi'advana tageous. that each of", these short-circuits? ex--, tends'. viewed in, the dire'ctiomoti the length" of the ,s radiatorswover. a portion. of; the. radiator. length; .fbr..example.= over ;a .portionilarger thanl /20 and smaller. than. Me ,jotjthe. radiator. length-.. n

In .tknown constructions .of. the:.-abovealien-.1 .v tioned.--.aerial.system. the radiators. arenformed; each 'a'len'gth'w pp ly corresponds by apluralitysof, tubes connectedrtorone. anothen;,, to half the wavelengthof the electricaloscillar by meansof cross-pieces. r Such.,a,.constnuctionn tions .to be transmitted. is heavy, hasarr unaesthetical;appearance; vmoreradiator CD "is interrupted in .view" of "the con-U over, catches much.wind .canrbe arrangedonly. with comparatively, great. diilicultyaandaisa themes-: of this aerial. system when tuned amounts. ap-g fore. less suitable for use-.imairplanes.

The inventionhas-:fon-its object.- .toaprovide. as Simple;- cheap andeha-ndy 1;construction"of th known aerial system which does not exhibit the abovermentionedtdisadvantages;:1:

According to the invention, the aerial system is constituted by a memb'er whichiliais the shape of a single elongated.rod-,.-. plate": or tubeaand in? which one or more slits are provided which; extend in the longitudinal direction.

The said member preferably "consists of a single rod;'*-tube or plate in which one or more slits are provided; so that; when starting? '-f-rom'-- rods *ortubes-"ofstandardized "dimensionsr it is possible to manufacture aerial-systems 'whose fg adaptation resistance mayhave in practice"any"=" possible value if onlyrithe.-=slits31areeprovided at a suitable point.

The. aerial system may also be built-up ofgtwor 40 ieederrV-z tubes'of U shaped"cross-sectionwhose open sides are turned towards one another, or again of a tube of U-shaped cross-section and a plate located in front of the open side of this tube, the spacing between the two tubes or between the tube and the plate being small with respect to the tube length.

Also in this way it is possible, when starting slit. from standardized profiles, to construct aerial Figs. 3 and 3a show the construction of a systems having an adaptation resistance which 0 folded dipole constituted by two U-shaped bars exhibits a plurality of difierent values. U1 and U2 the open sides of which are turned By providing the slits in such manner that they towards one another. At the ends AL and ED extend more or less far towards the ends, it is the bars are united, for example by welding. possible to obtain at these ends a short-circuit of Figs. 4 and 4a repres'ent .a similar construction the radiator which extends over. a shorter or consisting of, a U-shaped bar and a plate attion 'ofithe: radiator: length;- ther==aerial1 systemffiisi wide 'frequency band'. v

ments thereof."

system consists of twotub'esAB and"-CD*wh-ich are connected to one another by means'ofcross-r spectively. thanthe other. radiator...

muchiwind and cannot -.be.-arranged. .as easily as single. dipole;

possible to alter the adaptation resistance of the aerial system. It is also possible to provide a larger number of slits.

Starting from a solid rod, it is possible to obtain a folded dipole even by providing only onelonger portion of the: radiator. length. owingsto 'z; the use of a short-circuit extending. over a pore better' suitablei forv transmitting: oscillationsvoi ;-a:.-.=

The invention will be*explainedmorefullywith reference to r the: accompanying drawing. which-rs i p esents,- by way: of example-, some embodi 0 *Fig: 1 represents an aerial system-as' is known=-- under the 'designation:'---folded dipole? Thispieces. These tubes act as radiatorsand 'haver In. the middle the" nection of a feeder'V. The adaptation resistance;

proximately to250"ohms.. As is well-known, this resistance. .mayi, be decreased or increased -by... making the. fed; radiator thicker or thinner re-..

Theaboveedescribed construction of..the.folded-.. dipoleds -as set .outrhereinbefore, comparatively... heavy, has an unaesthetical appearance, catches.-

Fig..2.now represents an aerial. system;acc0rd:-.-;--: ing.,tor-theainventioni Thisaerial consists =ofa metaltubeexhibiting :on: either side slits extending in the longitudinal direction of the. tuber-so:- 35 thattwo.radiatorsaABs and CD 'are'formed'whichua are spaced fromzone another-by adistancewhieh; is small .relativelycto the length; ofxai radiators; Oneqofithe radiators thusdonned:(cDbisainter ruptedz: in order; to permit zof COIIIIBOtlHgi'IthaT By providingzthe'slitsion' a chord ('s'ee'Figl' 2bl instead "of onr a diameter (see Fig. 2117 it is 1 ranged in front of the open side of this bar. The spacing between the U-shaped bars in Fig. 3 and that between the U-shaped bar and the plate in Fig. 4 are small with respect to the length of the bar.

By a suitable choice of the dimensions of the U-bars, more particularly of the ratio between the bar heights a1: 112, it is possible to obtain a number of different values for the adaptation resistance of the aerial system so that suitable adaptation to feeders having surge impedances of difierent values can be obtained.

The bars U1 and U2 may be obtained, for example, by bending plates.

If desired the above-described aerial systems may, be closed at the ends by means of plates.

The aerial systems according to the invention exhibit the shape of a single dipole, can be Y mounted like a single dipole, are of light construction, have an aesthetical appearance and exhibit only a slight air resistance:

What I claim is:

1. A high-frequency aerial structure comprising a tubular conductive member having a length corresponding substantially to half a wave-length of the operating frequency and provided with a longitudinal slit passing completely through said member and extending from a point adjacent one end of said member to a point adjacent the other end thereof to define two parallel conductors whose corresponding ends are interconnected, one of said conductors being provided with a transverse slit at the midpoint thereof to define the two separate elements of a dipole, and feeder terminals on adjacent ends of said two elements.

3. A high-frequency aerial structure comprising a hollow conductive member of circular cross section having a length corresponding substantially to half a wavelength of the operating frequency and provided with a longitudinal slit passing through a diametrical plane in the member and extending from a point adjacent one end of said member to a point adjacent the other end thereof to define two parallel conductors whose corresponding ends are interconnected, one of said conductors being provided with a transverse slit at the midpoint thereof to define the two separate elements of a dipole, and feeder terminals on adjacent ends of said two elements.

4. A high-frequency aerial structure comprising a hollow conductive member of circular cross section having a length corresponding substantially to half a wavelength of the operating frequency and provided with a longitudinal slit passing through a chordal plane in-the member and extending from a point adjacent one end of said member to a point adjacent the other end thereof to define two parallel conductors whose corresponding ends are interconnected, one of said conductors being provided with a transverse slit at the midpoint thereof to define the two separate-elements-of a dipole, and feeder terminals I on adjacent ends of said two terminals.

5. A high-frequency aerial structure comprising a hollow conductive member of rectangular cross section having a length corresponding substantially to half a wavelength of the operating frequency and provided with a longitudinal slit passing through opposing walls of the member .and extending from a point adjacent one end of said member to a point adjacent the other end thereof, said slit being positioned to define two parallel U-shaped conductors whose corresponding ends are interconnected, one of said U-shaped conductors being provided with a transverse slit at the midpoint thereof to define the two separate elements of a dipole, and feeder terminals on adjacent ends of said two elements.

6. A high-frequency aerial structure comprising a hollow conductive member of rectangular cross section having a length corresponding to half a wavelength of theoperating frequency and provided with a longitudinal slit passing through opposing walls of the member and extending from a point adjacent one end of said member to a point adjacent the other end, said slit being positioned to define a U-shaped conductor disposed in parallelrelation with a planar conductor, the corresponding ends of the conductors being interconnected, the planar conductor being provided with a transverse slit at the midpoint thereof to define the two separate elements of a dipole, and feeder terminals on adjacent ends of said two elements.

PETER HANS KARL GABRIEL CORNELIUS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

